amazon rainforest：亚马逊热带雨林

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1、GeographyProjectAmazonRainforestByCornelieJacobson8/7IndexRainforestsIRainforestsIIRainforestsIIILayoutPeoplelivingtherePlantsAnimalsIAnimalsIICuttingdownCuresWhatisgoingtohappen?ResourcesusedRainforestsITropicalrainforestsareusuallyfoundnorthoftheTropicofCap

2、ricornandaroundtheEquatorThetemperaturevariesfromjustundertoover30degreesCelsiusduringtheyear.Tropicalrainforestshavequitealotofrainthroughouttheyear.About200mmonaverage.Rainforestsarecommonlyclassifiedbyclimate,altitude,andlatitude,eitheraloneorincombination

3、.ThephraseEquatorialRainforestreferstoforestsfoundintheequatorialzone10°eithersideoftheEquator;insomecasestherainforestextendsbeyondtheTropics,whereitiscalledSubtropicalRainforest.Inareasthatexperiencepronouncedchangesinseason(acycleofwetanddryseasons),thefor

4、estsareclassifiedasmonsoonrainforests.Rainforestcanalsoestablishitselfontropicalmountains.RainforestsIITheAmazonrainforestsareontheeastcoastofBrazilinPeru,itisalmostthirtytimesthesizeofGreatBritain.Thetermrainforesthasalsobeenusedtodescribesometemperatecommun

5、ities,suchasthenorthwestcoastalconiferousforestofNorthAmerica,whererainfallandhumidityarehighandwintersmild.Verticalstratificationoftreesandplantsisacharacteristicfeatureofrainforests.Tropicalsoilsaregenerallydiverse,rangingfromvolcanictoalmostpurequartzsands

6、.Sometimesonetoahalfofthetotalrainforestareaiscomposedofreddishlatosols(soilsfromwhichthenutrientshavebeenstripped).RainforestsIIITheforestfloorisdarkanditisdifficulttospottheanimals.Theplantsintherainforestneedlight,waterandwarmthtosurvive.Therainforestgetsa

7、bout200mmofrainayearandoneofthehottestdailytemperatures,25degreesCelsius.ThewarmairriseswhichcauseslowpressureovertheAtlanticoceananditrains.Duringthedaycloudsbuildupandintheafternoonitrains.Asthehotairrises,itcoolsdownandcloudsformthenitrainsthisiscalledClas

8、sicConvectionalrainfallMostofthewaterthatfalls,goesbackintotheatmosphere,itisinterceptedbythecanopy.Somefallstothefloorfortherootsbut20%oftherainfromthecanopyreachestheriver.Treesneednutr